From gleaming grottos to sinister stalactites, these amazing photos capture the natural wonders (plus some man-made additions) in caves from all corners of the Earth.

"Tired of cruising the city streets in the rain and fog, my husband and I headed for the Reed Flute Cave [in Guilin, China], expecting more a temporary escape from the rain than anything memorable. But once inside, we discovered otherworldly stone pillars illuminated by myriad colors that highlighted the unique formations."

"Picture taken at Green Grotto caves in Jamaica. The underground lake created a perfect setting for highlighting the natural beauty of the cave. Have to admit the lighting did create a colorful image."

"Driving around Maui I took this picture at a park we stopped at. You can walk down and see a great black sand beach. Not sure the picture does it justice but that just means you will have to go see it for yourself on the road to Hana, Wai'anapanapa State Park."

"Grotto Bay Beach Resort in Bermuda has two underground water caves on the property. Guests can take a plunge in the cool, underground waters of Cathedral Cave and Prospero’s Cave while marveling at the stalactites."

"In western Belize, deep inside Aktun Tunichil Muknal Cave, past a labyrinth of water tunnels in a crystalline underworld, Mayan priests prayed to Chac the Sustainer, sometimes making human sacrifices in their quest to please the gods. Tours of the cave offer a close-up glimpse of the ancient world."

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As seen on TV! We've followed Don Draper for seven seasons as he's crisscrossed the globe, be it via Cadillac or TWA flight. As the final episodes air, we're taking you back to the Golden Age of travel with a 'Mad Men'-inspired vacation guide for retro-style trips to cities Don visited.